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[ECONF] IS codes

 
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acpl_sefi
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Joined: 26 Jan 2003
Posts: 63

PostPosted: Tue Jul 22, 2003 8:37 pm    Post subject: [ECONF] IS codes Reply with quote

Dear All,

Our Codes for the new Century—problems and solutions

I have tried to gather my thoughts and have felt it is best to classify them by the various building materials:

Concrete:

I think we are on the right track. With ductility provisions somewhat in place and the new IS 1893-2002 bringing in endless debate will give code writers food for thought. My only wish is if the code publishing turn around time can be compressed to five years we should be reasonably up to with rest of the world in the next two code cycles.

Steel:

We are really half a century behind. As those of us exposed to the US codes will vouch we not need an overhaul—we need a new engine. There is also concern about INSDAG (the new steel society of India)—they are swinging it towards the British practice where Earthquake and ductility have low emphasis. I have not yet seen the new draft of IS 800 so I don’t know if the limit state approach has been adopted in steel (as in concrete & AISC--LRFD). It makes far more sense to the designer. Lots of lessons were learnt in the Northridge EQ—about moment connections and welds. All those need to be incorporated. The construction industry needs to brought up in sync with the designers as well before codes can be implemented.

Timber:

The less said the better. Renewable timber sources have long been used in the West. They have gone to limit State in timber design! We are in the dark ages—we haven’t even a program to use timber as a renewable building resource

Reinforced masonry:

See timber design above for general comments. We don’t have a code on reinforced clay masonry nor one on reinforced hollow block concrete masonry. Our masonry design handbook opens with an apology as to why reinforced masonry guidelines can’t be published—because the bricks are of poor quality--so there is no point! As for reinforced Concrete hollow block masonry code—it will always remain a draft. The houses that have been built around Delhi in hollow block masonry have developed cracks—wonder why!! A new material was

The Western world is banning its use in EQ areas. We go on undeterred. We will land up spending twice as much when we will be required to do a seismic retrofit. After all if lintel bands etc. alone did the trick why is everyone banning its use!!



Cold form steel:

A great promising industry and our codes only half a century old! We don’t have engineering faculty to teach Cold form steel design—there is no demand. The practices & design rules are very different from hot rolled steel. The design community and construction industry needs to be educated before this important building material can be tapped.. Codes need a sea change.

What ought to be done—

I think that code writing should be brought into the hands of the structural engineering organizations like SEFI or IAStructE etc. with the Govt. giving a token approval. Of course membership to these structural organisations is open to structural engineers from both Govt. & private sectors.

Also without legislation there can be no effective reprimand. There is no point in creating codes that can’t be implemented.

The only way the code writing process can be speeded up by having a legislation making the new code introduction cycle as a mandatory (say) 5 years. We should also not try to reinvent the wheel in code writing. We must build upon the research findings and experiences available elsewhere in the world rather waiting to gain our own experiences and always be lagging.

For now we are with the rest of our fellow country men- sab chalta hai.


Vipul Ahuja


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